Unlike those demigod demons, the Soul Eater Visarion is one of the few demons who think things through.
In a way, he's somewhat like the Demon Prince Demogorgon.
Initially, Visarion didn't stand out too much, simply hiding among the other demigod demons and launching his attacks against Lis and Adela in a moderately careful manner.
When Adela was restraining Visarion for Lis, he secretly made his move.
According to Adela afterwards, when she merely glanced at Visarion, a torrent of incredibly chaotic thoughts surged into her mind, causing her to briefly lose consciousness.
Although it was just a fleeting moment, in a battle between demigods, even such a brief lapse in concentration could lead to death.
Furthermore, according to Adela's account, all her soul and mental defenses were still intact at that time.
This meant that Visarion's soul attacks on Adela could even penetrate layers of defense.
This was quite astonishing!
